1 /* 2 * Copyright 2014 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "GrPrimitiveProcessor.h" 9 10 #include "GrCoordTransform.h" 11 12 /** 13 * The key for an individual coord transform is made up of a matrix type, and a bit that indicates 14 * the source of the input coords. 15 */ 16 enum { 17 kMatrixTypeKeyBits = 1, 18 kPositionCoords_Flag = 1 << kMatrixTypeKeyBits, 19 kTransformKeyBits = kMatrixTypeKeyBits + 1, 20 }; 21 22 /** 23 * We specialize the vertex code for each of these matrix types. 24 */ 25 enum MatrixType { 26 kNoPersp_MatrixType = 0, 27 kGeneral_MatrixType = 1, 28 }; 29 30 uint32_t 31 GrPrimitiveProcessor::getTransformKey(const SkTArray<const GrCoordTransform*, true>& coords, 32 int numCoords) const { 33 uint32_t totalKey = 0; 34 for (int t = 0; t < numCoords; ++t) { 35 uint32_t key = 0; 36 const GrCoordTransform* coordTransform = coords[t]; 37 if (coordTransform->getMatrix().hasPerspective()) { 38 key |= kGeneral_MatrixType; 39 } else { 40 key |= kNoPersp_MatrixType; 41 } 42 43 if (!this->hasExplicitLocalCoords()) { 44 key |= kPositionCoords_Flag; 45 } 46 47 key <<= kTransformKeyBits * t; 48 49 SkASSERT(0 == (totalKey & key)); // keys for each transform ought not to overlap 50 totalKey |= key; 51 } 52 return totalKey; 53 } 54
